The Coil Audio CA-70 modular tube mic/line amplifier is a preamp module inspired by vintage two-stage circuit designed by Western Electric in 1913 and manufactured throughout the 1930s and 1950s.
The Coil Audio CA-70 produces the typical thick tone of vintage tube preamps. It boasts Coil Audio’s own transformers, NOS octal tubes, high-quality capacitors and resistors.
Controls include Input and Output gain, phase reversal and Negative Feedback to brighten or darken the tone of the preamp by modifying the amount of negative feedback present in the circuit. The Low switch works in combination with the Negative Feedback to boost or cut low-frequency energy. The Hi switch offers gentle filtering of the upper frequencies. The two-stage output features CJ7 and 6C5 with the output control placed between each stage.
Coil Audio CA-70 Main Features:
Two-stage 6J7/6c5 vacuum tube circuit.
Negative feedback tone adjustment with high/low filters.
42db-54db of available gain.
Flexible input pad section for mic or line level operation.
150-ohm mic, 20k line input, 600-ohm output.
Interchangeable/optional input and output transformers.
NOS tubes, signal caps & resistors, PEC 2w carbon pots.
Up to six CA series amplifiers mount into our PS6 rack.
Hand built and tested in the USA.